Cutter short cone structure and cutter

Abstract

The utility model belongs to the technical field of cutters, and particularly relates to a cutter short cone structure and a cutter. A threaded blind hole used for being connected with a screw is formed in the center of the cutter short cone structure, and the cross section of the cutter short cone structure is provided with a closed contour. The closed contour comprises a first contour line, a second contour line and a third contour line, a first arc is simultaneously tangent between the first contour line and the second contour line, a second arc is simultaneously tangent between the second contour line and the third contour line, and a third arc is simultaneously tangent between the third contour line and the first contour line; and the peripheral surface of the short cone structure of the cutter has a taper matched with the insertion hole in the cutter handle. The cutter comprises a cutter body and a short cone structure installed on the cutter body. According to the utility model, more contact points can be provided for the matching of the cutter and the cutter handle, higher positioning precision and higher clamping rigidity are realized, and the use performance of the cutter is ensured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of cutting tools, and particularly relates to a short taper structure of a cutting tool and the cutting tool. BACKGROUND

[0002] In the machining process, the cutting tool is often installed on the tool holder, and the tool holder is installed on the spindle of the machine tool. This installation mode can facilitate the replacement and management of the cutting tool, improve the universality and interchangeability of the cutting tool, protect the spindle of the machine tool, and optimize the performance of the cutting tool.

[0003] At present, some cutting tools are matched with the cylindrical hole on the tool holder through the cylindrical handle part, and only the diameter needs to be matched. The insertion and extraction are convenient. As shown in the drawing 9 in the specification of the Chinese patent application for invention with the application publication number CN113857541A, when the cylindrical handle part of the cutting tool with this structure is matched with the tool holder, it is difficult to ensure that the rotation center of the cutting tool coincides with the rotation center of the spindle of the machine tool. When the torque is transmitted through the cylindrical surface contact, it mainly relies on the friction force, the contact area is small, and the cutting tool is prone to slipping when cutting under a large torque. The stability during cutting is poor.

[0004] In order to improve the stability of the cutting tool, the cutting tool with a tapered handle part also appears at present. As shown in the drawing 9 in the specification of the Chinese patent application for invention with the application publication number CN113857541A, when the tapered handle part is matched with the corresponding tapered hole on the tool holder, the position can be automatically adjusted under the action of slight axial force, so that the rotation center of the cutting tool coincides with the rotation center of the tool holder. This self-centering feature is very important in the high-speed rotating machining scene, and can effectively reduce the vibration and machining error caused by the eccentricity of the cutting tool. In addition, the tapered surface of the short taper has a larger contact area with the tapered hole, can withstand a larger cutting torque, and the short taper structure can better transmit the torque of the tool holder to the cutting tool, so that the cutting process is more stable. Figure 4 The advantages of the short taper structure also enable it to be applied in different cutting tools. With the higher machining requirements of workpieces, the positioning accuracy and clamping rigidity of the cutting tool are also required to be higher and higher. Therefore, how to further design and optimize the short taper structure to better play the performance of the cutting tool has become a problem to be solved at present.

[0005] UTILITY MODEL CONTENTS The utility model discloses a short taper structure of a cutting tool and the cutting tool.

[0006] The utility model discloses a short taper structure of a cutting tool and the cutting tool.

[0007] In order to solve the above problems, the short taper structure of the cutting tool provided by the utility model adopts the following technical scheme:

[0008] The utility model provides a tool short taper structure, is equipped with the threaded blind hole for connecting screw in the center, the cross section of tool short taper structure has a closed contour, the closed contour includes first profile line, second profile line and third profile line, first profile line and second profile line are tangent to first circular arc simultaneously, second profile line and third profile line are tangent to second circular arc simultaneously, third profile line and first profile line are tangent to third circular arc simultaneously, the outer periphery of tool short taper structure has the taper that adapts with the insertion hole on the handle.

[0009] Preferably, the lengths of the first profile line, the second profile line and the third profile line are equal, and the radii and arc lengths of the first circular arc, the second circular arc and the third circular arc are equal.

[0010] In one embodiment, the first profile line, the second profile line and the third profile line are each an eccentric circular arc arranged symmetrically about the center of the closed contour, the arc lengths and radii of the three eccentric circular arcs are equal, the center of the first profile line, the center of the second circular arc and the center of the closed contour are on the same straight line, the center of the second profile line, the center of the third circular arc and the center of the closed contour are on the same straight line, and the center of the third profile line, the center of the first circular arc and the center of the closed contour are on the same straight line.

[0011] In another embodiment, the first profile line, the second profile line and the third profile line are each a straight line, the included angle between any two of the first profile line, the second profile line and the third profile line is 60°, and the line connecting the centers of the first circular arc, the second circular arc and the third circular arc is an equilateral triangle.

[0012] Further, the taper ranges from 3° to 18°.

[0013] Further, one end of the tool short taper structure for insertion into the insertion hole is chamfered.

[0014] The tool short taper structure of the utility model has the following advantages: compared with the existing short taper structure, the tool short taper structure of the utility model is in the shape of a pyramid, and a plurality of edges are added to the taper surface, which can provide more contact points and achieve closer contact when cooperating with the insertion hole on the handle, thereby achieving more accurate positioning. In addition, the short taper structure in the shape of a multi-pyramid realizes over-positioning design, that is, the positioning of the tool not only depends on the taper surface but also relies on the accurate cooperation of the edges. This design ensures that the tool can be fixed at the same position and angle every time it is clamped, thereby improving the repeat positioning accuracy. Furthermore, the existence of the edges increases the contact rigidity between the tool and the handle, which can withstand greater torque during high-speed rotation of the tool and reduces deformation during cutting.

[0015] The tool short cone structure can be applied to different types of tools, and only needs to be assembled or integrally machined with different types of tool bodies, so that the positioning accuracy and cutting stability of the tool can be ensured after installation.

[0016] The technical scheme of the tool provided by the utility model is:

[0017] A tool comprises a tool body and a short cone structure installed on the tool body, the short cone structure is provided with a threaded blind hole for connecting a screw in the center, and the cross section of the short cone structure has a closed contour; the closed contour comprises a first contour line, a second contour line and a third contour line, the first contour line and the second contour line are simultaneously tangent to a first circular arc, the second contour line and the third contour line are simultaneously tangent to a second circular arc, and the third contour line and the first contour line are simultaneously tangent to a third circular arc; the outer peripheral surface of the tool short cone structure has a taper matched with a socket on a tool handle.

[0018] Preferably, the lengths of the first contour line, the second contour line and the third contour line are equal, and the radii and arc lengths of the first circular arc, the second circular arc and the third circular arc are equal.

[0019] In one embodiment, the first contour line, the second contour line and the third contour line are all eccentric circular arcs arranged in central symmetry around the center of the closed contour, the arc lengths and radii of the three eccentric circular arcs are equal, the center of the first contour line, the center of the second circular arc and the center of the closed contour are on the same straight line, the center of the second contour line, the center of the third circular arc and the center of the closed contour are on the same straight line, and the center of the third contour line, the center of the first circular arc and the center of the closed contour are on the same straight line.

[0020] In another embodiment, the first contour line, the second contour line and the third contour line are all straight lines, the included angle between any two of the first contour line, the second contour line and the third contour line is 60°, and the connecting lines between the centers of the first circular arc, the second circular arc and the third circular arc form an equilateral triangle.

[0021] Further, the range of the taper is 3° to 18°.

[0022] Further, one end of the tool short cone structure for being inserted into the socket is provided with a chamfer.

[0023] The utility model discloses a cutter's beneficial effect is: the utility model discloses a cutter adopts the short cone structure of the multi -prism pyramid, on the basis of existing taper surface, increased multiple edges, the existence of these edges makes the cutter and the jack plug cooperation on the handle provide more contact point, makes the cutter and the handle more closely contact, thereby realizes more accurate positioning.

[0024] The utility model discloses a cutter can be applied to the occasion of high -speed high -precision processing, and the overall size is smaller, and the service life is high. BRIEF DESCRIPTION OF DRAWINGS

[0025] The above and other objects, features and advantages of the exemplary embodiments of the present application will be readily understood through reading the detailed description of the exemplary embodiments of the present application below, with reference to the attached drawings. In the drawings, several embodiments of the present application are illustrated by way of example, and not limitation, in which the same or similar components are identified with the same or similar numbers, in which:

[0026] Figure 1 It is the three -dimensional structure schematic of the cutter short cone structure's embodiment 1 of the utility model Figure 1 ;

[0027] Figure 2 It is the three -dimensional structure schematic of the cutter short cone structure's embodiment 1 of the utility model Figure 2 ;

[0028] Figure 3 It is the plan view of Figure 1 ;

[0029] Figure 4 It is the schematic diagram of the closed contour on the cross section of the cutter short cone structure's embodiment 1 of the utility model

[0030] Figure 5 It is the three -dimensional structure schematic of the cutter short cone structure's embodiment 2 of the utility model Figure 1 ;

[0031] Figure 6 It is the three -dimensional structure schematic of the cutter short cone structure's embodiment 2 of the utility model Figure 2 ;

[0032] Figure 7 It is the plan view of Figure 5 ;

[0033] Figure 8 This is a schematic diagram showing the closed profile of a cross-section of an embodiment 2 of the short cone structure of the present invention.

[0034] Explanation of reference numerals in the attached figures:

[0035] 101. First eccentric arc; 102. Second eccentric arc; 103. Third eccentric arc; 104. First arc; 105. Second arc; 106. Third arc; 107. Threaded blind hole; 108. Tool body; 109. Chamfer; 201. First straight segment; 202. Second straight segment; 203. Third straight segment; 204. First arc; 205. Second arc; 206. Third arc; 207. Tool body. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Those skilled in the art should understand that the embodiments described below are only some, not all, of the embodiments disclosed. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0037] The principles and spirit of this utility model will be explained in detail below with reference to several representative embodiments.

[0038] Example 1 of the short cone structure for cutting tools provided by this utility model:

[0039] like Figure 1 and Figure 2 As shown, the short taper structure of the cutting tool is mounted on or integrally formed with the cutting tool body 108. A threaded blind hole 107 is formed at the center of the short taper structure for connecting a screw to tighten and fix the cutting tool to the tool holder. The cross-section of the short taper structure has a closed profile, which is formed by a first eccentric arc 101, a second eccentric arc 102, a third eccentric arc 103, a first arc 104 tangent to both the first and second eccentric arcs 101 and 102, a second arc 105 tangent to both the second and third eccentric arcs 102 and 103, and a third arc 106 tangent to both the third and first eccentric arcs 103 and 101. The outer circumferential surface of the short taper structure also has a taper adapted to the insertion hole on the tool holder.

[0040] The aforementioned eccentricity refers to the fact that the center of the first eccentric arc 101, the center of the second eccentric arc 102, and the center of the third eccentric arc 103 do not coincide with the center of the closed contour.

[0041] In the embodiment, the radii and arc lengths of the first eccentric circular arc 101, the second eccentric circular arc 102 and the third eccentric circular arc 103 are equal, the radii and arc lengths of the first circular arc 104, the second circular arc 105 and the third circular arc 106 are equal, and the first eccentric circular arc 101, the second eccentric circular arc 102 and the third eccentric circular arc 103 are arranged in central symmetry around the center of the closed contour, and the first circular arc 104, the second circular arc 105 and the third circular arc 106 are arranged in central symmetry around the center of the closed contour.

[0042] The center of the first eccentric circular arc 101, the center of the second circular arc 105 opposite to the first eccentric circular arc 101 and the center of the closed contour are on the same straight line, the center of the second eccentric circular arc 102, the center of the third circular arc 106 and the center of the closed contour are on the same straight line, and the center of the third eccentric circular arc 103, the center of the first circular arc 104 and the center of the closed contour are on the same straight line.

[0043] The end of the tool short taper structure for insertion into the insertion hole of the tool holder is provided with a chamfer 109, and the end face of the end is not a plane, but a curved surface with the same taper as described above.

[0044] In actual processing, the value of the taper can be 3°-18°, of course, the value of the taper is matched with the tapered hole in the tool holder, and reasonable selection can be made according to actual needs. In addition, the radius of the inscribed circle of the closed contour is also designed according to the size of the tapered hole in the tool holder.

[0045] Embodiment 2 of the tool short taper structure provided by the utility model:

[0046] The difference between the embodiment and the above-mentioned embodiment 1 of the tool short taper structure is only that the cross-sectional shape of the tool short taper structure is different. As shown in Figure 5 、 Figure 6 、 Figure 7 and Figure 8 , in the embodiment, the cross section of the tool short taper structure has a closed contour, which is formed by a first straight line segment 201, a second straight line segment 202, a third straight line segment 203, a first circular arc 204 tangent to the first straight line segment 201 and the second straight line segment 202, a second circular arc 205 tangent to the second straight line segment 202 and the third straight line segment 203, and a third circular arc 206 tangent to the third straight line segment 203 and the first straight line segment 201.

[0047] In the embodiment, the lengths of the first straight line segment 201, the second straight line segment 202 and the third straight line segment 203 are equal, the radii and arc lengths of the first circular arc 204, the second circular arc 205 and the third circular arc 206 are equal, and the first circular arc 204, the second circular arc 205 and the third circular arc 206 are centrally symmetrically arranged about the center of the closed contour. The included angle between any two of the first straight line segment 201, the second straight line segment 202 and the third straight line segment 203 is 60°, the extensions of the first straight line segment 201, the second straight line segment 202 and the third straight line segment 203 intersect with each other to form an equilateral triangle, and the lines connecting the centers of the first circular arc 204, the second circular arc 205 and the third circular arc 206 also form an equilateral triangle, and the centers of the two equilateral triangles coincide with the center of the closed contour.

[0048] The structures shown in the above embodiment 1 and embodiment 2 of the tool short taper structure are in the shape of a pyramid as a whole, compared with the traditional taper handle, a plurality of edges are added, which can provide more contact points when cooperating with the insertion hole on the tool handle, realize closer contact, and thus realize more accurate positioning. In addition, the short taper structure in the shape of a pyramid realizes over-positioning design through the precise cooperation of the taper surface and the edge, ensures that the tool can be fixed at the same position and angle every time it is clamped, and improves the repeat positioning accuracy. Furthermore, the existence of the edge increases the contact rigidity between the tool and the tool handle, which can withstand greater torque during high-speed rotation of the tool, and reduces deformation during cutting.

[0049] The structures shown in the above embodiment 1 and embodiment 2 of the tool short taper structure can be applied to different types of tools, such as ball end mills, drill bits, boring tools, etc. The tool short taper structure and the tool body of the corresponding type of tool can be assembled or integrally machined. When installed on a specific tool handle, the positioning accuracy and cutting stability of the tool can be ensured, and the service life of the tool can be improved.

[0050] The embodiments of the tool provided by the utility model:

[0051] The tool comprises a tool body and a short taper structure installed on the tool body, wherein the structure of the short taper structure is the same as that described in the above embodiment 1 and embodiment 2 of the tool short taper structure, and will not be described in detail here. In actual processing, the tool body and the short taper structure are manufactured in an integral molding manner, a tool withdrawal groove is arranged between the tool body and the short taper structure, the tool body can be the tool body 108 of a ball end mill, at this time, the structure of the whole tool can refer to Figure 1 and Figure 2 ; of course, the tool body can also adopt other types of tool bodies, such as the tool body 207 shown in Figure 5 and Figure 6 , and furthermore, boring tools, drill bits, etc. can also be adopted, and the type of the tool body is not specifically limited.

[0052] The tool has high positioning precision and clamping rigidity in actual use, and can be widely applied in high-speed high-precision machining occasions.

[0053] The above is only a preferred embodiment of the utility model, and is not used to limit the utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A tool short taper structure characterized by, The center of the short taper structure is provided with a threaded blind hole for connecting a screw, and the cross section of the short taper structure has a closed contour; the closed contour comprises a first profile line, a second profile line and a third profile line, the first profile line and the second profile line are tangent to a first circular arc, the second profile line and the third profile line are tangent to a second circular arc, and the third profile line and the first profile line are tangent to a third circular arc; The outer periphery of the short taper structure has a taper which is matched with the insertion hole on the shank.

2. A tool short taper structure according to claim 1, wherein The lengths of the first profile line, the second profile line and the third profile line are equal, and the radii and arc lengths of the first circular arc, the second circular arc and the third circular arc are equal.

3. A tool short taper structure according to claim 2, wherein The first profile line, the second profile line and the third profile line are eccentric circular arcs which are arranged in central symmetry around the center of the closed contour, the arc lengths and radii of the three eccentric circular arcs are equal, the center of the first profile line, the center of the second circular arc and the center of the closed contour are on the same straight line, the center of the second profile line, the center of the third circular arc and the center of the closed contour are on the same straight line, and the center of the third profile line, the center of the first circular arc and the center of the closed contour are on the same straight line.

4. The tool short taper structure according to claim 2, wherein The first profile line, the second profile line and the third profile line are straight line segments, the included angle between any two profile lines of the first profile line, the second profile line and the third profile line is 60°, and the connecting lines between the centers of the first circular arc, the second circular arc and the third circular arc form an equilateral triangle.

5. A tool short taper structure according to any one of claims 1-4, characterized in that The taper ranges from 3° to 18°.

6. A tool short taper structure according to any one of claims 1-4, characterized in that The end of the short taper structure for insertion into the insertion hole is provided with a chamfer.

7. A tool comprising a tool body and a short taper structure mounted on the tool body, characterized in that, The center of the short taper structure is provided with a threaded blind hole for connecting a screw, and the cross section of the short taper structure has a closed contour; the closed contour comprises a first profile line, a second profile line and a third profile line, the first profile line and the second profile line are tangent to a first circular arc, the second profile line and the third profile line are tangent to a second circular arc, and the third profile line and the first profile line are tangent to a third circular arc; 8. A tool according to claim 7, characterised in that The lengths of the first profile line, the second profile line and the third profile line are equal, and the radii and arc lengths of the first circular arc, the second circular arc and the third circular arc are equal.

9. A tool according to claim 8, characterised in that The first profile line, the second profile line and the third profile line are eccentric circular arcs which are arranged in central symmetry around the center of the closed contour, the arc lengths and radii of the three eccentric circular arcs are equal, the center of the first profile line, the center of the second circular arc and the center of the closed contour are on the same straight line, the center of the second profile line, the center of the third circular arc and the center of the closed contour are on the same straight line, and the center of the third profile line, the center of the first circular arc and the center of the closed contour are on the same straight line.

10. A tool according to claim 8, wherein The first profile line, the second profile line and the third profile line are straight line segments, the included angle between any two profile lines of the first profile line, the second profile line and the third profile line is 60°, and the connecting lines between the centers of the first circular arc, the second circular arc and the third circular arc form an equilateral triangle.

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